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(No Model.) 2 SheetsSheet I.-

A. CAMERON. WELL DRILLING MACHINE.

. No. 512,003. Patented Jan. 2, 1894.

III D W (No Model.) 2Sheets-Sheet 2. A; CAMERON. WELL DRILLING MACHINE.

No. 512,003. Patented m. 2, 1894.

Mrs STATES ARTHUR CAMERON, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREDERICKC. AUSTIN, OF SAME PLACE.

WELL-DRILLING MACHINE.

SPECIFICATION forming part of. Letters Patent No. 512,003, dated January2, 1894.

Application filed November 11, 1892. Serial No. 451,629. (No model-)Improvement in fell-Drilling Machines, of

which the following is a specification.

In a well-drilling machine characterized by my invention, the drill-ropeor cable is carried from a drum to a pulley arranged at the upperportion of a derrick or like support, and

thence down to the well-drilling tool. The well-drilling tool isalternately carried and permitted to drop by a' succession of pulls uponand releasements of the rope, in rapid alternation, and to such end therope is operated by avibratory walking beam or depressor whichintermittently pullsor draws upon the ope portion between the drum andderrick-pulley. The rope or cable passes from the drum to a pulley onthe free end portion of the walking beam and thence up to thederrick-pulley, and the walking-beam is arranged to vibrate about theaxis of the drum so as to secure greater efficiency'of action andvarious other advantages hereinafter more fully set forth. The walkingbeam is operated by a cam having acontinuous hearing face or surface,and the walking beam is continuously subject to such bearing face of thecam so as to avoid shocks. The walking beam is provided with a counterweight which permits the drilling tool to readily drop, the arrangementin this connection being such that the cam action serves to operate thewalking beam in a way to lift the drilling tool, while the latter indropping exerts a pull upon the rope in a way to cause the walking beamto follow the cam face.

In the accompanying drawings-Figure 1 represents in perspective, a welldrilling machine embodying my invention. Fig. 2 rep resents a verticallongitudinal section through a portion of the machine, which to alimited extent is further illustrated in elevation, said view alsoincluding the upper and lower portions of a derrick, so as to illustratethe use of the rope or cable.

The body-frame A of the machine herein shown is supported by front andrear wheels 1 and 2 so that the machine can be conveniently moved fromplace to place.

The pump mechanism B is arranged upon the forward portion of thebody-frame so as to permit the rope or cable which operates the drillrod, to extend upwardly from the rear portion of the machine to thepulley which is usually arranged at the top portion of a derrick.

It is not necessary to herein illustrate the derrick, the drill add allof the rope or cable employed, and hence I have herein shown only aportion of the rope or cable 3 in connection with the drum C, and thewalking beam or vibratory depressor D. The winding drum Cissupportedupon the body-frame and arranged just back of the pumping mechanism, andis adapted for a coil of rope or cable which passes back from the drumto a pulley at on the free rear end of the walking beam or vibratorydepressor, and thence up to the aforesaid derrick pulley, from whichlatter it is understood to pass down to the drill rod or drilling toolemployed. The drum is held against rotation in a direction to uncoil therope or cable, by a pawl E which is provided with a handle 5 for theconvenience of an operator, and which can be raised from engagement witha ratchet 6 on the drum axle, so as leave the latter free to turn in adirection to pay out the rope or cable in accordance With the extent towhich it is desired the drill shall drop. The rope or cable passes fromthe drum, to and under the pulley ion the rear portion of the walkingbeam or vibratory depressor, so that as a result of each down swing onthe part of said walking beam, the rope or cable will be depressed ordrawn down and thus secure a consequent up movement on the part of thedrill. This vibratory depressor or walking beam hung upon the axle 6 ofthe drum so as to vibrate about an axis passing axially through thedrum, by which arrangement I avoid lost motion, and further dispensewith all necessity for rotary reciprocating actions on the part of thedrum in conjunction with the actions of the walking beam.

In further explanation of the foregoing, it will be understood thatduring the vibratory action of the walking beam the drum will re- ICOmain stationary, and hence that one end of the rope will be in effecttied or held at a point close to the axis about which the Walking beamvibrates, and consequently close to the center of a circle in which thepulley 4 is carried. During the up and down swing, therefore, of thefree end of the walking beam, there will be no practical movement on thepart of the pulley 4 along the rope, since the length of rope portionbetween such pulley and the drum will be substantially invariable. Ifhowever the drum axis is arranged eccentric to the axis about which thewalking beam is to vibrate the length of rope portion between the drumand the pulley on the walking beam will be much greater at thecompletion of the down stroke or movement of thepulley than at thecompletion of the up stroke or'movement of the same. Such arrangementhowever is undesirable from the fact that considerable lost motion isinvolved, and that to secure a proper extent of stroke, a cam employedto actuate the walking beam, must be disproportionally large withrelation to the desired extent of stroke. By my arrangement however, Iavoid such lost motion and secure a stroke commensurate with the sizeand throw or stroke on the part of the cam, in addition to which I avoidfriction at the walking beam pulley and secure a quicker and generallybetter action.

As a matter of further improvement I provide a cam F adapted andarranged to have a constant engagement with the walking beam, so as toavoid shocks incident to the drop of the drill and consequent up swingon the part of the walking beam. The high and low bearing surfaceportions 7 and 8 of the cam are therefore arranged as portions of acontinuous bearing surface which can be in continuous engagement withthe walking beam, or more desirably, and as a matter of improvement, incontinuous engagement with an antifriction roller 9 on the walking beam.

The pivotally supportedend portion of the walking beam is bifurcated asat 10, so as to straddle or embrace the drum 0 and permit the sides offorked or bifurcated portion to be pivotally hung upon the drum shaft 6or similarly supported so as to turn about the axis of said shaft, inwhich Way, a steady motion on the part of the walking beam is insured,and the pulley at the free end of the walking beam positioned tomove-with the latter in a plane at right angles to the drum axis andintersecting the same midway of the length of the drum. The forked endportion of the walking beam is also extended beyond a as described.

the drum and adapted to support an adjustable balance or counterweight11.. This counter-weight serves to permit thereadydrop of thedrill-tool, it being seen that the drop of the drill-tool willnecessitate the up swing of the walking beam, and that by providing thelatter with a short forward end or arm having a balance orcounterweight, the drop of the drill will not be retarded by resistanceon the part of the long arm of the walking beam.

The rotary shaft 12 which carries the cam F'can be driven bysuitablyapplied power, as for example the power can be applied to abelt-pulley 13, and transmitted from a sprocket (not shown) on the shaftthereof, to a sprocket 14 on the camshaft, through the medium of alink-belt 15. The cam-shaft 12 can also be employed for rewinding therope or cable upon the drum, and to such end, the cam-shaft and drumshafts are respectively provided with sprockets 16 and 17, which areconnected by a chain or link-belt 18, and a clutch device G provided forplacing the sprocket 1.6 in clutch with the cam-shaft, when so desired.The shaft which carries the pulley 13 is provided with a balance wheel19, and with a pinion'20 which engages a gear wheel *21. The pumpmechanism can be driven from this gear through the medium of anyordinary or suitable mechanism, and which need not therefore be shown.

What I claim as my invention is 1. In a well-drilling machine, thecombination of the drum, a walking beam for the purpose set fortharranged to vibrate about the axis of the drum and extending both for- 9wardly and rearwardly therefrom, a cam for intermittently depressing theforwardly ex-- tending portion of the walking beam, and a counter-weightarranged upon the rearwardly extending portion of the same,substantially 2. In awell-drilling machine, the combination of the drum,the walking beam arranged to vibrate about the axis of the drum andextending forwardly and rearwardly therefrom for the purpose set forthand provided with a counter-weight upon its rearwardly extendingportion, and a cam having a continuous face which is in constantengagement with the forwardly extending portion of the walkr [0 ingbeam, substantially as described.

ARTHUR CAMERON.

Witnesses:

CHAS. G. PAGE, W. D. IVIIDDLETON.

